Happening on the first day of the war, it was one of its first clashes, and part of the larger Battle of Tuchola Forest. The incident became notable as reporters visiting the site soon after saw the dead bodies of horses and cavalrymen which led to false reports of Polish cavalry attacking German tanks. Nazi propaganda[5] took advantage of this, suggesting that the Poles attacked intentionally, believing that the Germans still had the dummy tanks the Versailles treaty restrictions had permitted them. The scene of Polish cavalry charging the Panzers with their lances has become a myth.[6]

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Polish units were engaged in battle from 0500 against elements of German 76th Infantry Regiment (Colonel Hans Gollnick) of 20th Motorised Division under Lt. Gen. Mauritz von Wiktorin, which operated on the left (northern) flank of XIX Panzer Corps under Gen. Heinz Guderian. Early in the day, Polish cavalry had intercepted German infantry moving towards the Free City of Danzig (Gdańsk) and slowed their progress.

At 0800, the Germans broke through Polish Border Guard units south of the Polish cavalry, which forced the Polish units in the area to start a retreat towards a secondary defence line at the river Brda (Brahe). 18th Pomeranian Uhlans Regiment (18. Pułk Ułanów Pomorskich) was ordered to cover the retreat.

Colonel Kazimierz Mastalerz decided to take the enemy by surprise and ordered Eugeniusz Świeściak, commander of the 1st squadron, to execute a cavalry charge at 1900 hours, leading two squadrons, about 250 strong. Most of the two other squadrons, and their TKS/TK-3tankettes, were held back in reserve.

The charge was successful: the German infantry unit was dispersed, and the Poles occupied the clearing. However, German armored reconnaissance vehicles appeared from the forest road, probably part of Aufklärungs-Abteilung 20, and soon the Polish units came under heavy machine gun fire, probably from Leichter Panzerspähwagen equipped with MG 34, or Schwerer Panzerspähwagen equipped also with a 20 mm gun. The Poles were completely exposed and began to gallop for cover behind a nearby hillock.[7]

Commander Świeściak was killed, as was Mastalerz, who tried to save him. About a third of the Polish force was dead or wounded. On the other hand, the German advance was halted long enough to allow the withdrawal of Polish 1st Rifle battalion and National Defence battalion Czersk from the nearby battle of Chojnice.

The Polish cavalry charge impressed the Germans and caused a delay in the offensive of the German 20th Motorised Infantry Division which considered a tactical retreat. This was however prevented by personal intervention of Gen. Guderian, who in his memoirs stated that he encountered his staff "wearing helmets, preparing an anti-tank gun for a possible Polish cavalry attack,"[8] and that "the panic of the first day of war was overcome quickly".[8]

Polish uhlan with wz. 35 anti-tank rifle. Military instruction published in Warsaw in 1938.

The Polish cavalry charge stopped the German pursuit for the day, and the units of Czersk Operational Group were able to withdraw southwards unopposed. Also, it took the Germans several hours to reorganise and continue the advance. On September 2, 1939, the 18th Pomeranian Uhlans Regiment was decorated by Gen. Grzmot-Skotnicki, the commander of the Operational Group, with his own Virtuti Militari medal for valour shown in this combat.

The same day, German war correspondents were brought to the battlefield, together with two journalists from Italy. They were shown the corpses of Polish cavalrymen and their horses, as well as German tanks that had arrived at the place after the battle. One of the Italian correspondents, Indro Montanelli, sent home an article, in which he described the bravery and heroism of Polish soldiers, who charged German tanks with sabres and lances. Although such a charge did not happen and there were no tanks used during the combat, the myth was used by German propaganda during the war. German propaganda magazine Die Wehrmacht reported on 13 September that the Poles had gravely underestimated German weapons, as Polish propaganda had suggested that German armored vehicles were only covered with sheet metal, leading to a grotesque attack. After the end of World War II, it was still used by Soviet propaganda as an example of stupidity of pre-war Polish commanders, who allegedly did not prepare their country for the war and instead wasted the blood of their soldiers. As late as the 1990s, this myth was still taught in history classes in American high schools and colleges.

Contrary to German propaganda, Polish cavalry brigades never charged tanks with their sabres or lances as they were equipped with anti-tank weapons such as 37 mm Bofors wz.36 (exported to UK as Ordnance Q.F. 37 mm Mk I) antitank guns, that could penetrate 26 mm of armour at 600 m at 30 degrees. The cavalry brigades were in the process of being reorganized into motorized brigades.

The myth of the cavalry charge against tanks was perpetuated by the Polish film Lotna (1959) in an invented reconstruction of this scene.[10] Till this day, the myth of Polish cavalry charging German tanks endures.[3]:43

^Zaloga, Steven J (2002), Poland 1939 — The birth of Blitzkrieg, Oxford: Osprey Publishing, If a single image dominates the popular perception of the Polish campaign of 1939, it is the scene of Polish cavalry bravely charging the Panzers with their lances. Like many other details of the campaign, it is a myth that was created by German wartime propaganda and perpetuated by sloppy scholarship. Yet such myths have also been embraced by the Poles themselves as symbols of their wartime gallantry, achieving a cultural resonance in spite of their variance with the historical record..